1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/param.h>
33 #include <sys/mtio.h>
34 #include <sys/socket.h>
35 #include <sys/time.h>
36
37 #include <ufs/ufs/dinode.h>
38
39 #include <netinet/in.h>
40 #include <netinet/in_systm.h>
41 #include <netinet/ip.h>
42 #include <netinet/tcp.h>
43
44 #include <protocols/dumprestore.h>
45
46 #include <ctype.h>
47 #include <netdb.h>
48 #include <pwd.h>
49 #include <stdio.h>
50 #include <limits.h>
51 #include <errno.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55
56 #include "pathnames.h"
57 #include "dump.h"
58
59 #define TS_CLOSED 0
60 #define TS_OPEN 1
61
62 static int rmtstate = TS_CLOSED;
63 static int rmtape;
64 static char *rmtpeer;
65
66 static int okname(const char *);
67 static int rmtcall(const char *, const char *);
68 static void rmtconnaborted(int);
69 static int rmtgetb(void);
70 static void rmtgetconn(void);
71 static void rmtgets(char *, int);
72 static int rmtreply(const char *);
73
74 static int errfd = -1;
75
76 int
rmthost(const char * host)77 rmthost(const char *host)
78 {
79
80 rmtpeer = strdup(host);
81 if (rmtpeer == NULL)
82 return (0);
83 signal(SIGPIPE, rmtconnaborted);
84 rmtgetconn();
85 if (rmtape < 0)
86 return (0);
87 return (1);
88 }
89
90 static void
rmtconnaborted(int sig __unused)91 rmtconnaborted(int sig __unused)
92 {
93 msg("Lost connection to remote host.\n");
94 if (errfd != -1) {
95 fd_set r;
96 struct timeval t;
97
98 FD_ZERO(&r);
99 FD_SET(errfd, &r);
100 t.tv_sec = 0;
101 t.tv_usec = 0;
102 if (select(errfd + 1, &r, NULL, NULL, &t)) {
103 int i;
104 char buf[2048];
105
106 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
107 buf[i] = '\0';
108 msg("on %s: %s%s", rmtpeer, buf,
109 buf[i - 1] == '\n' ? "" : "\n");
110 }
111 }
112 }
113
114 exit(X_ABORT);
115 }
116
117 void
rmtgetconn(void)118 rmtgetconn(void)
119 {
120 char *cp;
121 const char *rmt;
122 static struct servent *sp = NULL;
123 static struct passwd *pwd = NULL;
124 char *tuser;
125 int size;
126 int throughput;
127 int on;
128
129 if (sp == NULL) {
130 sp = getservbyname("shell", "tcp");
131 if (sp == NULL) {
132 msg("shell/tcp: unknown service\n");
133 exit(X_STARTUP);
134 }
135 pwd = getpwuid(getuid());
136 if (pwd == NULL) {
137 msg("who are you?\n");
138 exit(X_STARTUP);
139 }
140 }
141 if ((cp = strchr(rmtpeer, '@')) != NULL) {
142 tuser = rmtpeer;
143 *cp = '\0';
144 if (!okname(tuser))
145 exit(X_STARTUP);
146 rmtpeer = ++cp;
147 } else
148 tuser = pwd->pw_name;
149 if ((rmt = getenv("RMT")) == NULL)
150 rmt = _PATH_RMT;
151 msg("%s", "");
152 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
153 tuser, rmt, &errfd);
154 if (rmtape < 0) {
155 msg("login to %s as %s failed.\n", rmtpeer, tuser);
156 return;
157 }
158 (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
159 size = ntrec * TP_BSIZE;
160 if (size > 60 * 1024) /* XXX */
161 size = 60 * 1024;
162 /* Leave some space for rmt request/response protocol */
163 size += 2 * 1024;
164 while (size > TP_BSIZE &&
165 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
166 size -= TP_BSIZE;
167 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
168 throughput = IPTOS_THROUGHPUT;
169 if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
170 &throughput, sizeof(throughput)) < 0)
171 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
172 on = 1;
173 if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
174 perror("TCP_NODELAY setsockopt");
175 }
176
177 static int
okname(const char * cp0)178 okname(const char *cp0)
179 {
180 const char *cp;
181 int c;
182
183 for (cp = cp0; *cp; cp++) {
184 c = *cp;
185 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
186 msg("invalid user name %s\n", cp0);
187 return (0);
188 }
189 }
190 return (1);
191 }
192
193 int
rmtopen(const char * tape,int mode)194 rmtopen(const char *tape, int mode)
195 {
196 char buf[256];
197
198 (void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode);
199 rmtstate = TS_OPEN;
200 return (rmtcall(tape, buf));
201 }
202
203 void
rmtclose(void)204 rmtclose(void)
205 {
206
207 if (rmtstate != TS_OPEN)
208 return;
209 rmtcall("close", "C\n");
210 rmtstate = TS_CLOSED;
211 }
212
213 int
rmtread(char * buf,int count)214 rmtread(char *buf, int count)
215 {
216 char line[30];
217 int n, i, cc;
218
219 (void)snprintf(line, sizeof (line), "R%d\n", count);
220 n = rmtcall("read", line);
221 if (n < 0)
222 /* rmtcall() properly sets errno for us on errors. */
223 return (n);
224 for (i = 0; i < n; i += cc) {
225 cc = read(rmtape, buf+i, n - i);
226 if (cc <= 0)
227 rmtconnaborted(0);
228 }
229 return (n);
230 }
231
232 int
rmtwrite(const char * buf,int count)233 rmtwrite(const char *buf, int count)
234 {
235 char line[30];
236
237 (void)snprintf(line, sizeof (line), "W%d\n", count);
238 write(rmtape, line, strlen(line));
239 write(rmtape, buf, count);
240 return (rmtreply("write"));
241 }
242
243 void
rmtwrite0(int count)244 rmtwrite0(int count)
245 {
246 char line[30];
247
248 (void)snprintf(line, sizeof (line), "W%d\n", count);
249 write(rmtape, line, strlen(line));
250 }
251
252 void
rmtwrite1(const char * buf,int count)253 rmtwrite1(const char *buf, int count)
254 {
255
256 write(rmtape, buf, count);
257 }
258
259 int
rmtwrite2(void)260 rmtwrite2(void)
261 {
262
263 return (rmtreply("write"));
264 }
265
266 int
rmtseek(int offset,int pos)267 rmtseek(int offset, int pos) /* XXX off_t ? */
268 {
269 char line[80];
270
271 (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
272 return (rmtcall("seek", line));
273 }
274
275 struct mtget mts;
276
277 struct mtget *
rmtstatus(void)278 rmtstatus(void)
279 {
280 int i;
281 char *cp;
282
283 if (rmtstate != TS_OPEN)
284 return (NULL);
285 rmtcall("status", "S\n");
286 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
287 *cp++ = rmtgetb();
288 return (&mts);
289 }
290
291 int
rmtioctl(int cmd,int count)292 rmtioctl(int cmd, int count)
293 {
294 char buf[256];
295
296 if (count < 0)
297 return (-1);
298 (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
299 return (rmtcall("ioctl", buf));
300 }
301
302 static int
rmtcall(const char * cmd,const char * buf)303 rmtcall(const char *cmd, const char *buf)
304 {
305
306 if (write(rmtape, buf, strlen(buf)) != strlen(buf))
307 rmtconnaborted(0);
308 return (rmtreply(cmd));
309 }
310
311 static int
rmtreply(const char * cmd)312 rmtreply(const char *cmd)
313 {
314 char *cp;
315 char code[30], emsg[BUFSIZ];
316
317 rmtgets(code, sizeof (code));
318 if (*code == 'E' || *code == 'F') {
319 rmtgets(emsg, sizeof (emsg));
320 msg("%s: %s", cmd, emsg);
321 errno = atoi(code + 1);
322 if (*code == 'F')
323 rmtstate = TS_CLOSED;
324 return (-1);
325 }
326 if (*code != 'A') {
327 /* Kill trailing newline */
328 cp = code + strlen(code);
329 if (cp > code && *--cp == '\n')
330 *cp = '\0';
331
332 msg("Protocol to remote tape server botched (code \"%s\").\n",
333 code);
334 rmtconnaborted(0);
335 }
336 return (atoi(code + 1));
337 }
338
339 int
rmtgetb(void)340 rmtgetb(void)
341 {
342 char c;
343
344 if (read(rmtape, &c, 1) != 1)
345 rmtconnaborted(0);
346 return (c);
347 }
348
349 /* Get a line (guaranteed to have a trailing newline). */
350 void
rmtgets(char * line,int len)351 rmtgets(char *line, int len)
352 {
353 char *cp = line;
354
355 while (len > 1) {
356 *cp = rmtgetb();
357 if (*cp == '\n') {
358 cp[1] = '\0';
359 return;
360 }
361 cp++;
362 len--;
363 }
364 *cp = '\0';
365 msg("Protocol to remote tape server botched.\n");
366 msg("(rmtgets got \"%s\").\n", line);
367 rmtconnaborted(0);
368 }
369